Boric acid exist as solid due to [ Boric [B(OH)3] ] hydrogen bonded together into two dimensional sheet.
famous salt of boric acid is "Borax" is uses in
manufacturing of ENAMELS and glazes for pottery and disinfectant in medicine.
Wednesday, October 7, 2020
What is effect of heat on Borax?
When borax is strongly heated on loop of platinum wire, it loses water and form dehydrated disodium tetra borate which is swells into the white mass, which on further heating disodium tetra borate melts to form a transparent glassy solid called borax glass and borax bead.
When a solution of given salt is heated on bead , then volatile part of salt displaced by B2O3 and corresponding metaborates salt is formed which gives Characteristic colour on oxidizing and reducing flame and colour of the bead is noted in hot and cold for each type of flame. This is also called "BORAX BEAD TEST"
Related Questions:
Why Ga has small size than Al exceptionally
Why aqueous solution of borax reacts with two moles of acids ?
What is structure of solid Ortho Boric acid ?
What is the structure of trimetaboric acid and trimetaborate ion?
Why Borazine is more reactive than benzene towards Electrophic Aromatic substitution reactions ?
Why Borazine (B3N3H6) is also known as inorganic benzene ?.
Why B-F bond length in BF3 is shorter (130 pm) than B-F bond Iength in BF4- (143 pm)?. Explain.
Why B-F do not exist as dimer?. Explain.
Although anhydrous aluminium chloride is covalent but its aqueous solution is ionic in nature. Why?
Why Boric acid become strong acid in the presence of cis 1,2-diol or 1,3-diol ?
Four-center two-electron bond (4C-2e Bond): Structure of AlCl3:
What is the molecular formula of Borax ?
What is the difference between the structure of AlCl3 and diborane?
What are Nature of the alkali metal oxides(O-2), peroxides (O2-2) and superoxides (O-1/2) in hydrolysis reactions?
They all act as bronsted base and accept proton from water like,
O−2+ H2O(l)→2OH−(aq)
2O2−+2H2O(l)→2OH−(aq)+H2O2(l)+O2(g)
We know that H+ accepters are base so alkali metal oxides(O-2), peroxides (O2-2) and superoxides (O-1/2) are abstract proton from water so they are Bronsted base.
Related Questions:
What are the SESQUI OXIDES ? give the examples.
Monday, October 5, 2020
Why does SiCl4 undergo hydrolysis whereas CCl4 doesn't?
Their is mainly two reason that's why SiCl4 undergo hydrolysis while CCl4 Not .
First is steric hindrance , in case CCl4 Cl atoms blocking the C atom and preventing water molecules (nucleophile) from attacking it easily. While in case SiCl4 , Si is larger than C so there is less crowding so it is more susceptible to attack by the (water molecules) nucleophile.
Second reason is presence of vacant d orbital. Thus, Water, acting as nucleophile can attack easily at the vacant d orbital of Si and reaction will occur through penta co-ordinated transition state.But in case of CCl4 due to the absence of d orbital and smaller size of carbon makes ligand environment more crowded and nucleophile can't easily attack to the central atom.
Which amine is most basic in gas phase? (3° 2° Or 1°)
Tertiary amines are more basic than secondary amines, which are more basic than primary because in the gas phase, their is less stearic effect as well as no solvation effect so amines exhibit their basicities due to the electron-releasing effects of the organic substituents only , Thus 3° amines, has three ERG groups so it becomes more basic and ammonia is least basic than amines because their is no ERG .
Related Questions:
- What is relative basic strength order 1° amines , 2°amines and 3° amines ?
- Explain:Arrange the following in the increasing order of their acid strength : Methyl amine, Dimethyl amine, Aniline, N-methyl aniline (I.I.T, 1988).
- What is Carbylamine test or Isocyanide test ?
- What is Hinsberg's reagent and where Hinsberg's test use?
- Can we prepare aniline by Gabriel – phthalimide reaction?
- N-Ethyl-N-methyl propanamine does not show optical activity why?
- What is relative basic strength order 1° amines , 2°amines and 3° amines ? Explain:
- Amines are more basic than ammonia why?
- Give an explanation for the fact that Guanidine NH=C(CH3)2 is a stronger base than most of amines?
- Arrange in correct order of basic Character of aniline, pyrrol, pyridine and piperidine?
- What is correct basicity order of pyridine, pyridazine, pyrimidine and pyrazine ?
- Give an explanation for the fact that Guanidine NH=C(CH3)2 is a stronger base than most of amines?
- Arrange in correct order of basic Character of aniline, pyrrol, pyridine and piperidine?
- What is correct basicity order of pyridine, pyridazine, pyrimidine and pyrazine ?
- Why pyridine is more basic than Pyrrole?
- Why pyrimidine is less basic than pyridine?
- Imidazole is more basic than pyridine? Why?
- Biological Important of Imidazole and structure:
- Pyridine is almost 1 million times less basic than piperidine? Why?
- Cyclohexylamine amine is the stronger base than Aniline? Why?
- Tetrahydroquinoline amine is the stronger base than Tetrahydroisoquinoline? Why?
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